.page-about {
  --about-rail: 240px;
  background: var(--ink-deep);
  color: var(--paper);
}

.page-about .reveal-init {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .7s ease, transform .7s ease;
}

.page-about .reveal-init.is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 20px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--sage);
}

.page-about .breadcrumb a {
  color: var(--sage);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .25s ease, border-color .25s ease;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 22px 0 56px;
}

.page-about .about-hero__clock {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--sage);
}

.page-about .about-hero__tick {
  flex: 1;
  height: 1px;
  background-image: repeating-linear-gradient(90deg, var(--line-strong) 0 1px, transparent 1px 12px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
  margin-top: 22px;
}

.page-about .about-hero__title {
  display: flex;
  flex-direction: column;
  gap: .06em;
  margin: .32em 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.2rem, 7vw, 5rem);
  line-height: .96;
  letter-spacing: -.01em;
}

.page-about .about-hero__title-mark {
  color: var(--signal);
}

.page-about .about-hero__lede {
  max-width: 46ch;
  margin-top: 24px;
  font-family: var(--font-serif);
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  line-height: 1.85;
  color: var(--paper);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__media {
  margin: 0;
}

.page-about .about-hero__note {
  margin-top: 34px;
}

.page-about .about-hero__note p {
  margin: 0;
  font-family: var(--font-serif);
  font-size: .95rem;
  line-height: 1.8;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 52px;
    align-items: end;
  }
  .page-about .about-hero__media {
    transform: translateY(18px);
  }
}

/* ---------- 目录 + 正文布局 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 30px;
  padding-bottom: 64px;
}

.page-about .about-toc {
  border-left: 1px solid var(--line);
  padding-left: 18px;
}

.page-about .about-toc .kicker {
  margin: 0;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  font-size: 13px;
  line-height: 1.5;
}

.page-about .about-toc__list a {
  display: inline-block;
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color .25s ease, border-color .25s ease;
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

.page-about .about-toc__foot {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--sage);
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 64px;
  }
  .page-about .about-toc {
    position: sticky;
    top: 100px;
    align-self: start;
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: 40px 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 96px;
}

.page-about .about-section:first-child {
  padding-top: 0;
  border-top: none;
}

.page-about .about-section .kicker {
  margin: 0;
}

.page-about .about-section__title {
  margin: 14px 0 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.55rem, 3.4vw, 2.35rem);
  line-height: 1.26;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .about-section__lead {
  max-width: 58ch;
  margin-top: 18px;
  font-family: var(--font-serif);
  font-size: 1.04rem;
  line-height: 1.85;
  color: var(--paper);
}

.page-about .about-section__prose p {
  max-width: 62ch;
  margin-top: 16px;
  font-size: .97rem;
  line-height: 1.85;
  color: rgba(243, 247, 244, .84);
}

.page-about .about-section__prose .about-section__lead {
  color: var(--paper);
}

/* 拉引语 */
.page-about .about-quote {
  margin: 30px 0 0;
  padding: 22px 24px;
  background: var(--paper-warm);
  color: var(--ink-deep);
  border-left: 6px solid var(--signal);
  border-radius: var(--radius);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  line-height: 1.7;
}

.page-about .about-quote cite {
  display: block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--concrete);
}

/* ---------- 读者画像 ---------- */
.page-about .about-personas {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-persona {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  column-gap: 16px;
  row-gap: 6px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-persona__no {
  grid-row: 1 / span 2;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--signal);
}

.page-about .about-persona h3 {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--cyan);
}

.page-about .about-persona p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.8;
  color: rgba(243, 247, 244, .82);
}

/* ---------- 内容生产流程 ---------- */
.page-about .about-process {
  display: grid;
  gap: 30px;
  margin-top: 28px;
}

.page-about .about-process__media {
  margin: 0;
}

.page-about .about-process__steps {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  column-gap: 16px;
  row-gap: 6px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-step:first-child {
  border-top: none;
  padding-top: 0;
}

.page-about .about-step__no {
  grid-row: 1 / span 2;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .about-step h3 {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-step p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: rgba(243, 247, 244, .8);
}

@media (min-width: 900px) {
  .page-about .about-process {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    gap: 44px;
    align-items: start;
  }
}

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: 28px;
  margin-top: 30px;
}

.page-about .about-timeline__bg {
  margin: 0;
  max-width: 380px;
}

.page-about .about-timeline__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 25px;
  top: 8px;
  bottom: 18px;
  width: 1px;
  background-image: linear-gradient(180deg, var(--signal) 0%, var(--cyan) 45%, var(--line-strong) 100%);
}

.page-about .about-milestone {
  position: relative;
  padding: 0 0 26px 60px;
}

.page-about .about-milestone__badge {
  position: absolute;
  left: 0;
  top: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 26px;
  background: var(--ink-struct);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .06em;
  color: var(--cyan);
  transition: background .25s ease, color .25s ease, border-color .25s ease;
}

.page-about .about-milestone:hover .about-milestone__badge {
  border-color: var(--cyan);
}

.page-about .about-milestone__body h3 {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-milestone__body p {
  margin: 6px 0 0;
  font-size: .92rem;
  line-height: 1.8;
  color: rgba(243, 247, 244, .8);
}

.page-about .about-milestone--current .about-milestone__badge {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--ink-deep);
  font-weight: 700;
}

.page-about .about-milestone--current .about-milestone__body h3 {
  color: var(--signal);
}

@media (min-width: 900px) {
  .page-about .about-timeline {
    grid-template-columns: minmax(0, .6fr) minmax(0, 1fr);
    gap: 46px;
    align-items: start;
  }
  .page-about .about-timeline__bg {
    max-width: none;
  }
  .page-about .about-milestone {
    padding-bottom: 30px;
  }
}

/* ---------- 团队节点图 ---------- */
.page-about .about-network {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.page-about .about-node {
  position: relative;
  padding: 16px 18px;
  background: var(--ink-struct);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-node__tag {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .14em;
  color: var(--sage);
}

.page-about .about-node h3 {
  margin: 0;
  font-family: var(--font-body);
  font-size: .98rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-node p {
  margin: 8px 0 0;
  font-size: .9rem;
  line-height: 1.75;
  color: rgba(243, 247, 244, .78);
}

.page-about .about-node--hub {
  background-image: linear-gradient(135deg, rgba(255, 107, 26, .16), transparent 68%);
  border-color: rgba(255, 107, 26, .42);
}

.page-about .about-node--hub h3 {
  font-size: 1.1rem;
  color: var(--signal);
}

.page-about .about-node--contrib {
  border-style: dashed;
  border-color: var(--line-strong);
}

.page-about .about-node--contrib .about-node__tag {
  color: var(--print-yellow);
}

@media (min-width: 760px) {
  .page-about .about-network {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
  .page-about .about-node--hub {
    grid-column: span 6;
  }
  .page-about .about-node:not(.about-node--hub) {
    grid-column: span 2;
  }
  .page-about .about-node--contrib {
    grid-column: span 6;
  }
}

/* ---------- 服务范围 ---------- */
.page-about .about-scope {
  display: grid;
  gap: 26px;
  margin-top: 26px;
}

.page-about .about-scope__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-scope__list li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  column-gap: 14px;
  align-items: baseline;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
  font-size: .93rem;
  line-height: 1.7;
  color: rgba(243, 247, 244, .86);
}

.page-about .about-scope__list li:first-child {
  border-top: 1px solid var(--line);
}

.page-about .about-scope__list .data-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .about-scope__note p {
  margin: 0;
  font-family: var(--font-serif);
  font-size: .93rem;
  line-height: 1.85;
  color: var(--ink-deep);
}

.page-about .about-scope__note p + p {
  margin-top: 12px;
}

@media (min-width: 880px) {
  .page-about .about-scope {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 40px;
    align-items: start;
  }
}

/* ---------- 数据带 ---------- */
.page-about .about-band {
  margin-top: 44px;
  padding: 28px 20px 30px;
  background: var(--ink-struct);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  border-radius: var(--radius);
}

.page-about .about-band .kicker {
  margin: 0;
}

.page-about .about-band__head h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1.2;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .about-band__stats {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.page-about .about-band__stats li {
  display: grid;
  gap: 5px;
  padding-left: 14px;
  border-left: 2px solid var(--signal);
}

.page-about .about-band__num {
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 2.4vw, 1.55rem);
  line-height: 1.2;
  letter-spacing: .01em;
  color: var(--cyan);
}

.page-about .about-band__label {
  font-size: .8rem;
  line-height: 1.5;
  color: var(--sage);
}

@media (min-width: 780px) {
  .page-about .about-band {
    padding: 34px 30px 36px;
  }
  .page-about .about-band__stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

/* ---------- 收尾 ---------- */
.page-about .about-end {
  margin-top: 42px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.page-about .about-end p {
  max-width: 56ch;
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--paper);
}

.page-about .about-end__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 窄屏收束 ---------- */
@media (max-width: 480px) {
  .page-about .about-hero,
  .page-about .about-section {
    padding-left: 0;
    padding-right: 0;
  }
  .page-about .about-band__stats {
    grid-template-columns: minmax(0, 1fr);
  }
  .page-about .about-persona,
  .page-about .about-step,
  .page-about .about-scope__list li {
    grid-template-columns: 34px minmax(0, 1fr);
    column-gap: 12px;
  }
  .page-about .about-milestone {
    padding-left: 54px;
  }
  .page-about .about-timeline__list::before {
    left: 22px;
  }
  .page-about .about-milestone__badge {
    width: 44px;
    font-size: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .reveal-init {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .page-about .about-hero__media {
    transform: none;
  }
  .page-about .about-milestone__badge,
  .page-about .breadcrumb a,
  .page-about .about-toc__list a {
    transition: none;
  }
}